Visualization of normal-zone initiation and propagation using fluorescent paints

A. Ishiyama, H. Murakami, M. Tsuchiya, Hiroshi Ueda, H. Kato, K. Nara, Y. Shiohara

Research output: Contribution to journalArticle

Abstract

To establish a stability criterion for Yttrium barium copper oxide (YBCO)-coated conductors, it is necessary to clarify their transient thermal characteristics. Thermocouple thermometers, resistance thermometers, or the relation between the temperature and resistance of the stabilizer used for the conductors are generally employed for measuring their temperatures. However, these methods can only be employed to observe fixed-point data. Hence, it is difficult to observe the longitudinal and transversal distributions of temperatures in coated conductors. In this study, we adopt a method for the visualization of the temperature distribution of coated conductors by using fluorescent paints whose color changes with temperature. By adopting this method, we can measure the two-dimensional distribution of temperature in magnetic fields and at cryogenic temperatures. Therefore, local heat generation in the YBCO tapes can be observed with a higher spatial resolution and the uniformity in the critical current density of YBCO tapes can be identified. In this paper, we describe the developed thermal visualization system and the preliminary experimental results of the visualization of normal-zone initiation and propagation in YBCO sample strips. Further, we also report a part of the normal-zone initiation and propagation mechanism by electromagnetic field and heat transfer analyses by employing a three-dimensional finite element method (FEM).

Original languageEnglish
Article number012169
JournalJournal of Physics: Conference Series
Volume97
Issue number1
DOIs
Publication statusPublished - Feb 1 2008
Externally publishedYes

Fingerprint

paints
barium oxides
copper oxides
yttrium
conductors
propagation
tapes
temperature
resistance thermometers
heat generation
thermometers
cryogenic temperature
thermocouples
strip
critical current
finite element method
electromagnetic fields
temperature distribution
spatial resolution
heat transfer

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Visualization of normal-zone initiation and propagation using fluorescent paints. / Ishiyama, A.; Murakami, H.; Tsuchiya, M.; Ueda, Hiroshi; Kato, H.; Nara, K.; Shiohara, Y.

In: Journal of Physics: Conference Series, Vol. 97, No. 1, 012169, 01.02.2008.

Research output: Contribution to journalArticle

Ishiyama, A. ; Murakami, H. ; Tsuchiya, M. ; Ueda, Hiroshi ; Kato, H. ; Nara, K. ; Shiohara, Y. / Visualization of normal-zone initiation and propagation using fluorescent paints. In: Journal of Physics: Conference Series. 2008 ; Vol. 97, No. 1.
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